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Java Program to create a HashMap and add key-value pairs
To create a HashMap, use the HashMap class −
HashMap hm = new HashMap();
Add elements to the HashMap in the form of key-value pair −
hm.put("Bag", new Integer(1100)); hm.put("Wallet", new Integer(700)); hm.put("Belt", new Integer(600));
The following is an example to create HashMap and add key-value pair −
Example
import java.util.*; public class Demo { public static void main(String args[]) { // Create a hash map HashMap hm = new HashMap(); // Put elements to the map hm.put("Bag", new Integer(1100)); hm.put("Wallet", new Integer(700)); hm.put("Belt", new Integer(600)); // Get a set of the entries Set set = hm.entrySet(); // Get an iterator Iterator i = set.iterator(); // Display elements while(i.hasNext()) { Map.Entry me = (Map.Entry)i.next(); System.out.print(me.getKey() + ": "); System.out.println(me.getValue()); } System.out.println(); } }
Output
Belt: 600 Wallet: 700 Bag: 1100
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